Sanding machine



May 8. 1928.

1,669,094 A4 R. LANDQUlsT SANDING MACHINE Filed May 29. 1926 2Sheets-She 1 May s, 192s. 1,669,094

A. R. LANDQUIST SANDING MACHINE Filed May 1926 2 Sheets-Sheet 2 PatentedMay 8,1928. i

4Ppxrlazlar oFFICE.

ANDREW n. IiANDoUIsT, or MINNEAPOLIS, MINNESOTA.

SAN DING MACHINE.

Aliplieauon med may v29,Y

This invention relates toa sanding 4machine particularly adapted for use1n connection with the sandingv `of articles having surfaces thereon ofvarying heights and fvarying curvatures such, for example, asSchooldesls and` seats, tables, chairs, etc;V

` It is an object of this invention to provide ay sanding Vmachinehaving a sanding`"'belt therein mounted on a carriage ywhich will' bevertically adjustable to quickly position the working run of the sandingbelts'at various heights.

Itis another *objectA of the invention to provide in such av machineA acounter-balanced carriage upon which the sanding belt is mounted.

These'and other objects and advantages of the invention will more fullyappear from the following description made in connection with the accomanying drawings in which like reference c aracters refer to the saine orsimilar parts throughout the several views and in which Fig. 1 is` aview in front elevation of the device, certain of th'e parts beingbroken away; v v Fig. 2 is a horizontal section taken on the line 2--2lof Fig. 1 as indicated by the arrows; and A 3Q Fig. 3 is a verticalsection takenpn the line 3 3 of Fig. 1 as indicated by `the arrows. 'y

Referring to the drawings, preferably a base a is providedhavinglsecuredjthereto the vertical standards rectangularly spaced inyrelation to onenanother .to form an upright frame preferably gofgreater length than. width; The end standards .5 of the `'frame aretransversely connected together at their tops by the bars 6 shown as Ibars extending transversely ofthe frame. Facing inwardly from the yendsof the frame, the tracks 7, shownas I bars, are provided secured to thestandards 5 and extending vided comprising guide members 8, shown asinwardly flanged channel bars which slidably engage with tracks 7, andthe bars 9,

shown as channel bars, secured to-the guide members 8 and extendinglongitudinally of lthe frame between the Vrespective front and rearmembers'8. V The .ends of 4the carriage are connectedtogether bysuitable bracing 10 extending between the respective end guides whilethe angular braces 11 are preferably provided connected tothe bars 9 andsubstantially vertically. A carriage is pro 1926. seriaiNo. 112,499.

`to the guides 8 at spaced points. LBars-12, `shown as angle bars, aresecured to the bars 6 inwardly of the standards 5` and extendlongitudinally of the frame formed bysaid standards at the top thereof.y i f l n Two bars13 are fixed .transversely between the bars 9 `at thecentral portion of the1,car riagc and form a seat upon which ya motor 14ofany common Vtype may be secured. The Inotor `14 has an elongatedshaft-,projecting rearwardly therefrom upon which .is mounted the pulley15, the rear end of the shaft being journaled in the bearing 16 securedto the rear bar 9. Horizontal shafts 17 and 17a are journaled inbearings 18sel cured adjacent the lower ends of the guide members 8. Anendless belt 19 placed over` pulley 15 drives one of the shafts, as 17,through the pulley 2O secured on the shaft opposite the pulley 15, theshaft accordingly forming the drive .shaft for the machine.

Sanding belt pulle s 21 are secured to shafts 17 and 17'a at their frontends forward of the front bearings 18. A shaft 22 journaled in bearings23 and 24, secured respectively tothe front bar 9 and the barsvlQ,carries the pulley Q5 thereon extending forwardly` of. the front-bar 9of the carriage and alined with the `pulleys 21. Asanding belt 26 havingan jabra-sive outer surface fits overthe pulleys 21 `and 25, the 'beltbeingloosely stretched over the pililleys." A bracket 127" extendsdownwardly from `the frontrbarj9 of the carriage and has `pivotedthereto the armQS to one Vend of which in turn .the pulley,k 29 isjournaled, said` arm 28 having its 4other end. Pulley 29v extendsforwardly `of arm LQS-and is adapted ,to contact the convenientlyraising, or lowering the car- `the adjustable weight 30 lsecuredtheretoat riage in the frame. Brackets 35 securedto the inner rsides ofthe bars9 and .projecting downwardly therefrom have journaled therein theshafty36 provided at itsj outer endy withV the steering wheel. 37 andhavingjsecured at itsfkcentral portion thek drum 38.

Arected when in operation.

' comprising a body portion 42, bearings 43,

axles 44 and flanged wheels 45 secured at the Vouter ends of the axles44, is placed on the tracks 41. A dust collecting casing 46 having thesliding door 47 at its lower extremity is secured at the front side of afront stand ard 5 at the end of the frame towards which the working runof the sanding belt is di- Casing 46 partially encompasses one of thepulleys 21.

Rotating tools as the sanding disk 48 secured to shaft 17 and the drillchuck 49 secured to shaft 17a may be placed on the free ends oftheshafts 17 and 17 a.

Operation.

An article to be sanded is placed on the body portion 42 of the workholding platform and the platform is pushed inwardly on the tracks 41towards the rear of the frame until the portion of the surface of thearticle to be operated upon isplaced directly below the sanding' belt26. The carriage is n ow slidably lowered by rotation of the steeringwheel 37 of the steering wheel windlass until the lower or working runof the belt 26 is positioned with its abrasive surface closely adjacentthe surface of the article to be sanded, the guidemembers 8 of thecarriage sliding downwardly on the tracks 7 ofthe frame until thisposition is reached. The

- weights 34 will counter-balance the carriage so that the same'will becapable of being quickly and readily moved as the drum of thesteering'wheel windlass is turned. The motor 14 may now be started andpower will be'transmit-ted through the pulley 15, belt 19, pulley 20,shaft 17 and pulley 21 fixed on shaft 17 to the sanding belt 26. Thesanding belt 26 will vaccordingly be rapidly rotated over the pulleys 21and 25. An operator may now stand in front of the article to be sandedand by a suitably shaped block (not shown) may hold the working run ofthe belt against the surface to be sanded. As the belt 26 fits looselyover the pulleys, the same may be curved to fit the various curvaturesof the article operated upon. IThe belt tightener comprising the members28, 29 and 30 will properly tension the belt at all times to prevent thesame from slipping. By varying'the position of the' weight 30 on the arm28, the tension of the belt tightener may lb@ varied. f The majority ofdust from the sanding operation will be carried by the belt 26 to thedust collecting casing 46, the sliding door 47 providing a handy meansfor removal of the dust from the casing 46. As the work progresses, thework-holding platform maybe pushed to `or from the belt as desired, tooperate upon various portions of the surface of the'article.

When it is desired to vary the vertical position of the working run ofthe sanding belt, as for example, when a surface of an article standingat a greater height or lesser height than the surface being worked uponis tobe operated upon, the windlass wheel 37 may again be revolved andthe carriage and lower run of the sanding belt accordingly `quicklyraised or lowered through the sliding engagement of the guide members 8with the tracks 7 until the proper vertical level is reached.

As in the present invention all the operating mechanism for the sandingbelt is mounted directly upon the sliding carriage, no adjustment ofpower transmission mechanism is necessary when the vertical position ofthe sanding belt is changed. The device can accordingly be quickly andeasily raised or lowered to properly position the sanding belt forengagement with articles of variable heights.

When the machine is not in use, the workholding platform may be pushedinwardly under the carriage to the position shown in Fig. 2 so that theplatform will be out of the way. The sanding disk 48 and drill chuck 49or other rotating tools that may be carried by the shafts 17 and 17awill be found convenient for use in connection with the other parts ofthe machine.

Various types of abrasive or polishing belts may be used in connectionwith the machine, the device being equally eective for polishingarticles as for sanding them. The specific type of belt tightener,steering wheel windlass, and counter-balancing vmeans may be varied,while the positions of the motor, driving shaft and the sanding beltpullleys may be changed as desired. The frame and carriage constructioncan also be considerably varied.

lllhe device comprises few parts, is simple in operation and may becomparatively cheaply made and assembled. The device has been amplydemonstrated in actual practice and has been found to be very successfulfor the purposes set forth.'

It will, of course, be understood that various changes may be made inthe form, details, arrangments and proportions of the parts Vwithoutdeparting from the scopepof applicants invention which, generallystated, consists in the matter yshown and described and set forth in theappended claims.

`What is claimed is: V

1. A sanding machine having in combination, rectangularly spacedstandards forming vertical tracks, a carriage slidable on said tracks, amotor mounted onksaid carriage, al plurality of pulleys mounted forrotation on said carriage, means for driving one of said pulleys fromsaid motor, an abrasive belt adapted to run over said pulleys, the lowerrun of said belt projecting downwardly from said carriage, means forcounter-balancing said carriage to hold the same in any desired positionor to permit the same being quickly shifted to different levels, andmeans for moving the carriageto any desired level.

2. The structure defined in claim 1, said last mentioned meanscomprising a cable secured at both ends to stationary supports 4andextending substantially vertically beside the carriage, and a drumjournaled in said carriage and around which the medial portion of saidcable is wound, the said drum being capable of being turned.l

In testimony whereof I affix my'signature.

' f ANDREW R. LAIIDQUIST.y

